List setters in subpackages

cmd/config/internal/commands/test/testdata/dataset1/mysql/Krmfile

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+apiVersion: krm.dev/v1alpha1
+kind: Krmfile
+metadata:
+  name: mysql
+packageMetadata:
+  shortDescription: sample description
+openAPI:
+  definitions:
+    io.k8s.cli.setters.namespace:
+      x-k8s-cli:
+        setter:
+          name: namespace
+          value: myspace
+    io.k8s.cli.substitutions.image-tag:
+      x-k8s-cli:
+        substitution:
+          name: image-tag
+          pattern: ${image}:${tag}
+          values:
+          - marker: ${image}
+            ref: '#/definitions/io.k8s.cli.setters.image'
+          - marker: ${tag}
+            ref: '#/definitions/io.k8s.cli.setters.tag'
+    io.k8s.cli.setters.image:
+      x-k8s-cli:
+        setter:
+          name: image
+          value: mysql
+    io.k8s.cli.setters.tag:
+      x-k8s-cli:
+        setter:
+          name: tag
+          value: 1.7.9

cmd/config/internal/commands/test/testdata/dataset1/mysql/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  namespace: myspace # {"$openapi":"namespace"}
+  name: mysql-deployment
+spec:
+  replicas: 3
+  template:
+    spec:
+      containers:
+      - name: mysql
+        image: mysql:1.7.9 # {"$openapi":"image-tag"}

cmd/config/internal/commands/test/testdata/dataset1/mysql/nosetters/Krmfile

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+apiVersion: krm.dev/v1alpha1
+kind: Krmfile
+metadata:
+  name: storage
+packageMetadata:
+  shortDescription: sample description

cmd/config/internal/commands/test/testdata/dataset1/mysql/nosetters/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  namespace: myspace
+  name: nosetters-deployment
+spec:
+  replicas: 4
+  template:
+    spec:
+      containers:
+      - name: nosetters
+        image: nosetters:1.7.7

cmd/config/internal/commands/test/testdata/dataset1/mysql/storage/Krmfile

@@ -0,0 +1,13 @@
+apiVersion: krm.dev/v1alpha1
+kind: Krmfile
+metadata:
+  name: storage
+packageMetadata:
+  shortDescription: sample description
+openAPI:
+  definitions:
+    io.k8s.cli.setters.namespace:
+      x-k8s-cli:
+        setter:
+          name: namespace
+          value: myspace

cmd/config/internal/commands/test/testdata/dataset1/mysql/storage/deployment.yaml

@@ -0,0 +1,12 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  namespace: myspace # {"$openapi":"namespace"}
+  name: storage-deployment
+spec:
+  replicas: 4
+  template:
+    spec:
+      containers:
+      - name: storage
+        image: storage:1.7.7